048
FNCA52 TJSJ 060730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST THU AUG 6 2026
DISCUSSION
CRITICALLY DRY FUELS CONTINUE ACROSS PORTIONS OF THE LOCAL
ISLANDS, PARTICULARLY ACROSS SOUTHERN PUERTO RICO, ST. CROIX, AND
OTHER FIRE- PRONE AREAS OF THE U.S. VIRGIN ISLANDS. ALTHOUGH
ISOLATED SHOWERS AND LOCALIZED THUNDERSTORMS REMAIN POSSIBLE THIS
AFTERNOON, MAINLY ACROSS INTERIOR AND WESTERN PUERTO RICO, RECENT
RAINFALL HAS BEEN LIMITED OVER THE SOUTHERN COASTAL PLAINS, WHERE
FUELS REMAIN RECEPTIVE TO FIRE STARTS. WINDS WILL REMAIN
RELATIVELY LIGHT TODAY, KEEPING THE FIRE WEATHER THREAT LIMITED
THROUGH THE REMAINDER OF THE AFTERNOON.
A DRIER AND MORE STABLE WEATHER PATTERN WILL BECOME ESTABLISHED
BEGINNING TODAY AND PERSIST INTO THE WEEKEND AS MOISTURE
DECREASES AND EASTERLY WINDS STRENGTHEN. LOWER RELATIVE HUMIDITY,
INCREASING SUNSHINE, AND BREEZY CONDITIONS, COMBINED WITH
CRITICALLY DRY FUELS, WILL ELEVATE THE POTENTIAL FOR RAPID
WILDFIRE GROWTH AND SPREAD, PARTICULARLY ACROSS SOUTHERN PUERTO
RICO AND THE U.S. VIRGIN ISLANDS. RESIDENTS AND VISITORS ARE
ENCOURAGED TO AVOID OUTDOOR BURNING AND USE CAUTION WITH
ACTIVITIES THAT COULD PRODUCE SPARKS, AS FIRE WEATHER CONDITIONS
ARE EXPECTED TO BECOME INCREASINGLY FAVORABLE IN THE COMING DAYS.
PRZ014-062000-
SOUTHEAST COASTAL PLAINS-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 40 0 10
TEMP (24H TREND) 91 (+1) 74 (-2) 92
RH % (24H TREND) 46 (-8) 88 (0) 44
WIND 20FT/EARLY(MPH) E 16 E 13 E 17
WIND 20FT/LATE(MPH) SE 16 NE 9 E 19
MIXING HGT(FT-AGL/MSL)5520 5520
TRANSPORT WND (MPH) E 16 E 16
VENT RATE (KT-FT) 77280 77280
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-062000-
SOUTHERN HILLS-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 0 20
TEMP (24H TREND) 88 (+2) 71 (-2) 90
RH % (24H TREND) 59 (-8) 95 (+1) 54
WIND 20FT/EARLY(MPH) E 11 E 11 E 12
WIND 20FT/LATE(MPH) SE 12 NE 10 E 13
MIXING HGT(FT-AGL/MSL)6250 6370
TRANSPORT WND (MPH) E 13 E 14
VENT RATE (KT-FT) 68750 76440
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-062000-
NORTH COASTAL PLAINS-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 30
TEMP (24H TREND) 92 (+2) 73 (-3) 91
RH % (24H TREND) 58 (-8) 97 (+3) 57
WIND 20FT/EARLY(MPH) E 13 E 16 E 13
WIND 20FT/LATE(MPH) E 19 E 11 E 18
MIXING HGT(FT-AGL/MSL)5510 4970
TRANSPORT WND (MPH) E 15 E 17
VENT RATE (KT-FT) 71630 74550
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-062000-
NORTHERN HILLS-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 20 20
TEMP (24H TREND) 90 (+3) 71 (-1) 90
RH % (24H TREND) 63 (-6) 97 (-1) 61
WIND 20FT/EARLY(MPH) E 11 E 12 E 12
WIND 20FT/LATE(MPH) E 14 E 9 NE 16
MIXING HGT(FT-AGL/MSL)6290 5780
TRANSPORT WND (MPH) E 12 E 15
VENT RATE (KT-FT) 62900 75140
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-062000-
WEST COAST-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 50
TEMP (24H TREND) 92 (+1) 73 (-1) 93
RH % (24H TREND) 60 (-6) 98 (+2) 58
WIND 20FT/EARLY(MPH) E 12 E 12 E 11
WIND 20FT/LATE(MPH) E 13 E 11 SE 13
MIXING HGT(FT-AGL/MSL)5110 4930
TRANSPORT WND (MPH) E 10 E 9
VENT RATE (KT-FT) 45990 39440
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-062000-
EASTERN INTERIOR-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 30
TEMP (24H TREND) 91 (+3) 72 (-3) 91
RH % (24H TREND) 56 (-7) 96 (+2) 54
WIND 20FT/EARLY(MPH) E 12 E 11 E 11
WIND 20FT/LATE(MPH) E 12 E 10 E 13
MIXING HGT(FT-AGL/MSL)7240 6740
TRANSPORT WND (MPH) E 14 E 15
VENT RATE (KT-FT) 86880 87620
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-062000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 40
TEMP (24H TREND) 85 (+3) 71 (-2) 86
RH % (24H TREND) 65 (-7) 98 (+1) 61
WIND 20FT/EARLY(MPH) E 11 E 9 E 10
WIND 20FT/LATE(MPH) E 11 E 8 E 11
MIXING HGT(FT-AGL/MSL)4820 4680
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 53020 60840
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-062000-
CENTRAL MOUNTAIN RANGE-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 40
TEMP (24H TREND) 87 (+5) 69 (-1) 87
RH % (24H TREND) 68 (-8) 98 (0) 64
WIND 20FT/EARLY(MPH) E 9 E 8 E 9
WIND 20FT/LATE(MPH) SE 10 E 8 E 10
MIXING HGT(FT-AGL/MSL)7540 7780
TRANSPORT WND (MPH) E 8 E 10
VENT RATE (KT-FT) 52780 70020
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-062000-
CAYEY MOUNTAIN RANGE-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 10
TEMP (24H TREND) 85 (+2) 71 (-1) 87
RH % (24H TREND) 66 (-3) 98 (0) 61
WIND 20FT/EARLY(MPH) E 11 E 10 E 11
WIND 20FT/LATE(MPH) E 11 NE 8 E 12
MIXING HGT(FT-AGL/MSL)5810 5580
TRANSPORT WND (MPH) E 13 E 16
VENT RATE (KT-FT) 63910 78120
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-062000-
VIEQUES-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 30
TEMP (24H TREND) 90 (0) 77 (-3) 91
RH % (24H TREND) 55 (-3) 87 (+4) 54
WIND 20FT/EARLY(MPH) E 14 E 12 E 14
WIND 20FT/LATE(MPH) E 14 E 14 E 14
MIXING HGT(FT-AGL/MSL)3680 3310
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 55200 52960
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-062000-
CULEBRA-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 40
TEMP (24H TREND) 91 (+1) 78 (-3) 92
RH % (24H TREND) 59 (-5) 91 (+6) 56
WIND 20FT/EARLY(MPH) E 14 E 12 E 13
WIND 20FT/LATE(MPH) E 14 E 13 E 14
MIXING HGT(FT-AGL/MSL)3580 3510
TRANSPORT WND (MPH) E 16 E 18
VENT RATE (KT-FT) 50120 56160
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-062000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 20
TEMP (24H TREND) 92 (+1) 73 (-3) 92
RH % (24H TREND) 50 (-6) 88 (-2) 48
WIND 20FT/EARLY(MPH) E 17 E 16 E 14
WIND 20FT/LATE(MPH) SE 18 E 14 SE 19
MIXING HGT(FT-AGL/MSL)5110 5330
TRANSPORT WND (MPH) E 17 E 12
VENT RATE (KT-FT) 76650 53300
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-062000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 30
TEMP (24H TREND) 89 (+1) 76 (-4) 90
RH % (24H TREND) 60 (-3) 91 (+7) 57
WIND 20FT/EARLY(MPH) E 14 E 13 E 14
WIND 20FT/LATE(MPH) E 14 E 14 E 14
MIXING HGT(FT-AGL/MSL)3660 3560
TRANSPORT WND (MPH) E 16 E 18
VENT RATE (KT-FT) 51240 56960
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-062000-
ST CROIX-
330 AM AST THU AUG 6 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 90 (+1) 77 (-3) 90
RH % (24H TREND) 61 (-2) 91 (+5) 58
WIND 20FT/EARLY(MPH) E 14 E 13 E 14
WIND 20FT/LATE(MPH) E 14 E 14 E 14
MIXING HGT(FT-AGL/MSL)4900 4810
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 78400 81770
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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